It's National Smile Day, and when I think of amazingly beautiful smiles, I think of Park So Dam in Cinderella and Four Knights and Ji Chang Wook in The K2 (he may not smile much in this drama, but when he does, I just melt!). So my question today is, which K-drama star do you think has the best smile?

I just put the question out over DramaFever's official Snapchat account, username @dramafever, so please hop on Snapchat and send me a message telling me which K-drama star you think has the best smile.

Here is our Snap code:

The responses are already coming in!

If you don't have Snapchat, then please leave your comment below!

And see more of Ji Chang Wook's beautiful smile in The K2!